Men getting Viagra on the internet could be placing themselves at improved danger of heart problems or other serious side-effects, English scientists warn.A number of researchers have analysed samples of Viagra distributed on the net and found a few of the anti-impotence drugs covered different parts or less of the active component compared to the genuine top-selling medicine created by pharmaceutical huge Pfizer Inc.On our initial calculate, around 1 / 2 of these Viagra products could possibly be fake," Dr Nic Wilson, of the College of London, informed the British Pharmaceutical Conference.